Job Specifications
Security Architect - OT - Operational Technology
£700p/d - Outside IR35
Hybrid working with 2-3 days onsite in Preston
6 months initially, with possible extensions due to the long-term nature of the programme.
DV or SC Cleared required
An exciting opportunity has arisen with a highly recognised organisation in the defence sector, focused on transforming and modernising military and security infrastructure through data-driven digital transformation, battlefield management systems, and advanced cybersecurity.
ABOUT THE ROLE
In this role you will be joining a bigger team of Security Architects delivering secure, mission-critical systems across the IT/OT environment for a defence client based in Preston.
You will be responsible for defining, designing, and governing the architecture of industrial and operational systems that control and monitor physical processes. The role ensures OT environments are secure, and acting as a technical authority across Industrial Control Systems (ICS), SCADA, and IIoT. You will provide strategic direction alongside hands-on architectural leadership.
WHAT WILL YOU DO?
OT Architecture & Strategy
Support long-term OT roadmaps, modernization initiatives, and IT/OT convergence
Define and maintain OT architecture principles, standards, and reference designs
Design end-to-end OT solutions covering control systems, networks, data flows, and integrations
Ensure architectures meet safety, availability, and operational resilience requirements
Industrial Systems & Platforms
Architect solutions across ICS, SCADA, DCS, PLCs, and HMIs
Review designs, vendor solutions, and system changes for architectural compliance
Produce clear architecture documentation, standards, and guidance
Support integration of OT systems with enterprise IT, cloud, and data platforms
Define standards for industrial protocols (e.g. Modbus, OPC UA, DNP3, IEC 61850)
Embed security-by-design into OT architectures
Define OT network segmentation, zoning, and access controls (Purdue Model / IEC 62443)
Conduct risk assessments, threat modeling, and architecture assurance reviews
Support compliance with safety and security regulations and standards
WHAT DO YOU NEED TO BE SUCCESFUL ?
Proven experience as an Architect in complex environments
Strong experience with IT/OT environments and industrial control system architectures
Understanding of OT cyber security principles and standards
Experience with ICS/SCADA/DCS environments
Knowledge of industrial networking and protocols
Understanding of IT/OT integration and data flows
Proven experience as an Architect in complex environments
Previous experience working on MOD and defence project is desired, but not essential
For more information and immediate consideration please apply today. Immediate interviews available.
About the Company
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